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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d87878b7c684b9885ba1d59d000c2c644fb938825399d899c3602a2fcd874e' 
  AND token = 'OR9r5K2eSYsY44KPj1pb3QqwHJ34XB5TnP69irMUHOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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