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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e49b2f599f1def5cb068a8aed97084ba8995e8d76590f39bfa6d4e4ea8d63c7' 
  AND token = 'tW6fumx0CA3AvUWVW72jR+bqW/2GrS2GrxQ0OooMfIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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