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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69653ca039386f4d9151622c7535b0d571d521d5e2e05420d14e431445a9d83' 
  AND token = 'cLZbr+Na+da4Fs6lmt6ielOOh0oy/z7z6B89gnmxr+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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