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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea751e8ca65fdde59839fe3812eff802f70183cfd5b1b5a014924c374b2a05a' 
  AND token = '/0sZ0W+2Q5HgGKAbPE2sZoZBR8Gt95q8L0sJMpjW5QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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