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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb5da80f223c3ea9c645a22c76bf1eca37dc712b58e7972d5eea626d295cfa9' 
  AND token = 'SM3ILBnXm4odHtB4ZW3fcoXH7eG3rOUKNxKdrC3bpmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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