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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886fdf0d93afa9ac87b0fba4106abe8c3f315674c98ca3aa304cfaa881e24c14' 
  AND token = '8va5J5dn4RFe8Iba75scy8FVac7RZSLrCU3JRWB/qmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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