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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c5ff3871144de69dc066a15a47971980d79ede6184cf4ba36ec248c0f8a107' 
  AND token = 'F0l3ZhaXHeGq8sMO4PsItlfsIpO5op1E647kJ+Oxlqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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