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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803b0fa19214789105120a3e40a490c922c46ede695e790d9eada46e74858155' 
  AND token = 'FgfoMaw9jJlcSV1HMGXki5F3ltmHEJWyxbxz2Jl8fiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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