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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff69655d0af92ecb92e170549f4ebc0875abfd702d48455a7769597b9e8751e' 
  AND token = 'jxdFh3ygMgi4IILauLVtqdWodfGISMxeOcnkOjbnJNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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