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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b8d44f15f488324a75b13c1c2e5188dc9e28195c0d39d9d3485c14f823f8f8' 
  AND token = 'H/Qz+jKhfBhy1stb2rgo8uM8++B5OwduuBMMZCZEiis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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