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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba3552fd0d951c13d55634d0fdfdd9f6381ff03b0fc0c6e835663c195866752' 
  AND token = 'lMPbepEmijzoKY4yrFFoBu1PU8Xj4QXy1JxPVoiNG+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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