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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a9365d55037ae219c2ab8d3bb97cb12ce0e35668663f11406f760eea6e30f0' 
  AND token = 'qG4qQlZIUVO0lTo2Qz5juL1yfqLzW0R5OT8l1PdMRgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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