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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56558784f6612dfc3393b3e4e1e712f6014eb5505aa28eab1ef9fd2fb73d4761' 
  AND token = 'Mix2r5BwtO/LuMAyUp+6N3+rHD1Gr00NR+D14EnsZ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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