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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb94b3072a01e108355221da04266a0b8142393e35d64c33be53f6248946176' 
  AND token = 'jmWf6r+1Pm4p6LN9tx93hi7h9hIt6OrcHR3h7lsdSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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