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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a94b243e1bd907beecba39b481b28982530a375b885697381f7a5f06a93df8a' 
  AND token = 'TPtwrnOn7udNQvNlsaKSrnBr8dDxzsJWm/iTngGucwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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