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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a007bda11437d836c581672cc8a081ebcb195ae2d63efe5cfc7c27e5cbbb422a' 
  AND token = 'N8Nztwmdqaoppw8Jveven9C3rJsLe/T0D/gTpbKSCV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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