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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e752882e4e02a17bde5a0d14c00889453774be885c0e0f949e2ea45543fecd64' 
  AND token = 'VTjgtvOy6dnTMbS7u7XRcDpiLUF/GbsV5g38L7Kp/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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