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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4123af0bf950cabfa898bd9de1453dc55958d2bfc31d2538d6ab82723070bf54' 
  AND token = 'JLBfkbdOp4vx/2Eej8FtkmiB19F2m9XZBAw+DL10t/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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