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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bb42c747c6d5508569667126bea6be6b12f713319d3e71fc1044a1f49637ea' 
  AND token = 'lL81FNuK1+U5G4KYqbEx1xV4qM2hQyfWea5yO/x6ndo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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