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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaed8b451f22d5f0e608b382a83f306bdca162c0be92858f391ecc9ca7ca0cdb' 
  AND token = 'Wc6M51Y27ibhl+8TlVfiksCj5+13E/8vf7BG5EJPB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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