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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3d6a497bb194dad7c086c7385a79a968b7128d664c500670181761bbbf86f9' 
  AND token = '/Kj1mmUUJBaF+fbfL2W6J+lWwmrxEv4MOxZ4Y7L3UTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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