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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74aa462019ec15c7be5125afe6acc11fae4aa365d53bdda6424d2006ae0207c8' 
  AND token = '97HyE4Yq1DvztiZ5MKbXwpCm4wXPVv0r0qeczi/kWxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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