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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7f0088f50989343d66fd4a14cb6a233de101ed22af8b72a27d312c85ac4434' 
  AND token = 'eANWohEYwc4z5eVjh5VjIpyFJSz9gxDQH4XJahl2oqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}