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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f54f3ad1ed3bbd6d38e8ccea9675aa1a2f6dea8137d82e1f21e4d6eed8edc80' 
  AND token = '2+VCF6onEjpqooXm13pp9t9GcV/+8ZSGq9ej5vwOzds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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