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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd148a8e044fe7336dc51d9e596e3e77aba3175e6b7238ef5f837b75d120b15ea' 
  AND token = '27TMAGuj8ZsbBx9US/nESlDwyUNaFO8Ze7V+iLXNXZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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