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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60852b003397b05b304bd08e22fc7b48e6b700b698043621ce1c57f649ee9485' 
  AND token = 'HCVaq7hQQns4AW1G3EQmuV6RpGK0c1tkpIpM7P6KBCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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