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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44242e087ec98c04fee836c0f13212ae0c345ce3b279c5ecca936bca9a449799' 
  AND token = 'cJAsisB3Uy3lxXGLDBte0TLpq8BJVznyeUF3H9ftNIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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