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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b047bdd86eac0135fe7771115db473d395f4d01347eea4efb511a7d36f2f55' 
  AND token = 'Nv1a5DwQN2/LM9wU8TJJwo14PTRCU2pM0y9FN6s62bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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