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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cc44529836863df5c5828bbb3f317a3ef0f192a002c98b3d2c27184e923c2b' 
  AND token = 'DSSkRUZf66eqrOL6tQDLPiWg+Ra/3YJchXbkn/s1liA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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