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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8832200383f5ad8594fdf8b9f70f128216d3f5d6922cd0e4c09d2c2705c30e6' 
  AND token = 'OIaX5OV65NCVlSEt/4oAspxB0fg5PpEIIpo7BIybV+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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