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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62d984623aa757c4758e1a1639df9b3befa306b69a08c17148f2ed713049264' 
  AND token = 'uYvcmIlY3Dbr7wa9VV3JilY4xy1co07ZcJdX9i1kJ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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