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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f90d4db9292e2997672c23df71b2d692fa5b3e9d013921e0ceda0aeea26623d' 
  AND token = 'OHtVw95IPWvXx1Nd0qRylWY+ZzfAuX6RflrTVSIrq7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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