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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bffe41ffd10e9d6caa7bed24ea08cccf90f07d7011f7b7f1dd18597ddcaeba' 
  AND token = 'wNH5cazyKOC5R4xCC282pUcz6L/NvNBCHz2k0K5gHs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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