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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93827cec82804a19dd803c12160587d9902ee625f6f0c3d3ad592c006ecb7d49' 
  AND token = 'vhHoM5a2ueBoOSit0su43rTnI4BPreWPOx3TuOFzl/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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