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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c101e6215f98c71103825f98241a7365f04d55ef81dce749dd84d5380318393' 
  AND token = '3oNh2N8PToVrcVsXP2GQyT5bZzyIm9Vp0d756Ro3hEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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