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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528a5f6e87935cbf6a15d9ffd469993e297cd58904f2064b5606dd328c16f56c' 
  AND token = 'RPhQ2Pt3JQhsUTBEZb1Lcs6MSN2uwB0HO9XzanXtabs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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