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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6132539ff4a0b2a2590e16ab990d5add257b71808a00fa503b2ddf01914ed8a6' 
  AND token = 'hL9eJzNjDHvs7jUGnck1EakApoBEkmCpuv31h+wp3go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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