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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4100fd4a62cd281c5db1b692cd7c3f6f77200c159fdbe683d0cfea1af5cd92' 
  AND token = '1K1nLhpCaJ5WwAhPd9ouMl8VwCI8NAws1UT7Iyjk9WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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