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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442631f2e87fed61da88479d8511fae58ccec14ba6f596bf7d64fd96e0d8f3da' 
  AND token = 'PlkQ1Q9kbT/qqhZZ8gAV1DOAlfrVoqQNX7Kcxon/EiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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