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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911502201f6da1f34956a36721eb871cdb3931d592c3acd663801d15a8bf7cfd' 
  AND token = 'RtoJRkT0FrBhLNwGCIGlf5QGLVdW2faMZ1qReG4uHlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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