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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28d6480357829e0d4e2e9f09d8385df65627a04f9e7bd8d4d1298d82decf23f' 
  AND token = 'JZMMA7ggPU8JyMFAW0JcLx6CpyHoXE1VPsstGeCk6l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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