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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203f78b053ab450470b55396c04befda6783674c39497e4c2b522beaf26961a3' 
  AND token = 'yZKmxaIHa/XU2YxaA9P5uQlbWILKv4YinF8UfOvNsDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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