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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f65f1e8d201fc2c5003f9e23111f51aa10b34bedf6dd556bbaa27e25588ec7' 
  AND token = 'Nl8Lyaof02bJXxz9xCTVwDsLbqW44Q4qoFb+mhs+w7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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