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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47250d462c4d9342dd28750b4054e41f2816fa1d08a280d47466acfea196719' 
  AND token = 'YCPsA7xjjJ3P2LlYJJWaHxsgAkqY+whWc532Q0IeP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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