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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa110ff36b4e4d886e3e8c530708c4127695122ad31a034952f65e7adc9701a' 
  AND token = '73EraedK+hy1pEB1AkwbzJx8HeAvXelV4Ptc5owPS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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