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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a63ea77fdc773d9a5d9090da13661f989b2bdffa93a59b63cdc411d4bbbb1b' 
  AND token = 'sUfNhTOFVfR+8VvmrvK+h/OFSVfRd6HzE/KMNm6Al+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"
  }
}