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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46c56a66a0f6031fd1b69ecb5b6d820369bfa45dbe2095497ac0bd92c12fffd' 
  AND token = '2eXMFye6ap3j+dAgIbwTFlp2Iq5Vughywu+io26s25c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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