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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87de9020195a298f7861f8a961380544d308e8f22a2abf110605475500cd6b1d' 
  AND token = 'qmJvdix2UbBNviQFByQ/tKD4QVNEcp9M0znyjPbDiaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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