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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c28a761ee53c789569d3d0243362103fa86348c7c9069ee8c791fba670d65ea' 
  AND token = 'fEqFXQkm7zbQIT4dHo2sAJ7zV6XVDMHh25k6vl4oYq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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