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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3591c3e09b35617aded4b8103fee9266c99275b5938d1861ba37e06ba831b3' 
  AND token = 'EEG6ST1rQbQu6Q8yoWshS/vnFtI8Ieqsoo62t+1VcN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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