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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcf9f04872a1af56513dd4f98dac60c4c41c5e4f66c91c5d8c97a4c21cd921f' 
  AND token = 'wjT8GjVPMmXJ3UrIxVeJDH4iS+ch8USwGx9AZEU34Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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