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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa21281a304670a93184833ed3d6513b690c4e6b2ff93a8665086ce4aff82629' 
  AND token = 'iqNZNDaD0H3oeq1cjUeIqqOtexfSSvXC2JGdIS9thPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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